Bulletin of the American Physical Society
5th Joint Meeting of the APS Division of Nuclear Physics and the Physical Society of Japan
Volume 63, Number 12
Tuesday–Saturday, October 23–27, 2018; Waikoloa, Hawaii
Session LK: Mini-Symposium: Intersections of Neutrino and Charged Lepton Scattering |
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Chair: Cynthia Keppel, Jefferson Laboratory Room: Hilton Queen's 4 |
Saturday, October 27, 2018 9:00AM - 9:30AM |
LK.00001: A close link between electron-nucleus scattering and neutrino-nucleus scattering Invited Speaker: Makoto Sakuda Neutrino oscillation experiments aiming to measure CP violating phase and mass-hierarchy need accuracy of 5% or better in neutrino-nucleus cross section. Nuclei which current and future neutrino oscillation experiments use as targets are carbon, oxygen, ion and argon. The charged-current neutrino-nucleus quasi-elastic scattering (and also pion production) is the dominant reaction in the neutrino energy from 200 MeV to GeV region. This quasi-elastic scattering is mainly used in the experiments to reconstruct the neutrino energy which determines the neutrino oscillations. CVC hypothesis states that an iso-vector part of the neutrino-nucleus charged-current and an iso-vector part of electron-nucleus electromagnetic current form a triplet of iso-vector current. I would like to start with a close link between electron-nucleus scattering and neutrino-nucleus scattering and then, review nuclear effects, such as form factors, initial/final state interactions and Pauli blocking, which electron-nucleus scattering experiments can answer and are very important for the precision of the neutrino-nucleus scattering experiments. |
Saturday, October 27, 2018 9:30AM - 9:45AM |
LK.00002: Validation of neutrino energy estimation using electron scattering data Mariana Khachatryan To study neutrino oscillations, the knowledge of the initial neutrino energy is required. This energy cannot be determined directly because neutrino beams have a broad energy distribution. Instead, the initial energy is estimated from the final state particles using two main approaches. It can be determined either from the total energy of all the final state particles or, if the neutrino scatters quasi-elastically from a bound nucleon then the initial energy can be calculated approximately using the scattered angle and the energy of the outgoing charged lepton. However this is not the case in real experiments, where nuclei such as argon, iron, carbon or other heavy nuclei are used to have higher interaction rates. We have applied the methods of neutrino energy estimation to the Jefferson Lab CLAS electron scattering data for 2.2 and 4.4 GeV electrons incident on 3He, 4He, C and Fe targets. We show that the energy reconstruction from the scattered electron plus proton provides a better description of the beam energy than the energy reconstruction from the scattered electron alone, however only 16 - 52% of events reconstruct to within 5 percent of the beam energy. |
Saturday, October 27, 2018 9:45AM - 10:00AM |
LK.00003: Radiative effects simulation for electrons and neutrinos interactions with nuclei, in a neutrino dedicated Monte Carlo. Adi Box ashkenazi Neutrino oscillation measurements relies on a proper simulation of neutrino-nuclei interactions. Nowadays, several operational MC generators are simulating the neutrinos interactions with a nucleon inside a nuclei, including GENIE, vastly in use within the neutrino community. We present the improvements and validation of GENIE simulation environment by comparing its output when simulating electrons interactions to existing data from previous electron scattering experiments for the first time. Our work includes the necessary radiative corrections for the electron simulation mode, which could be partially used also for the neutrino mode. |
Saturday, October 27, 2018 10:00AM - 10:15AM |
LK.00004: What electron scattering data tell us about nuclear models used in neutrino interactions Artur Ankowski Electrons and neutrinos probe nuclei in a very similar manner. Referring to the results of Phys. Rev. D 91, 033005 (2015), I am going to argue that the availability of precise data for electron scattering gives us, therefore, a unique opportunity to test nuclear models employed in neutrino scattering. At the kinematics where the impulse approximation is valid---the interaction between the beam particle and the nucleus can be described as involving a single nucleon with the remaining (A-1) nucleons acting as spectators---comparisons to electron quasielastic scattering data validate the description of the ground-state properties of the nuclear target. At higher energy transfers, such tests expose problems related to the description of pion production. As inaccuracies observed in electron scattering affect predictions for neutrino scattering, they have important consequences for neutrino-oscillation results. |
Saturday, October 27, 2018 10:15AM - 10:30AM |
LK.00005: Factorization of the Lepton-Nucleus Cross Section and Spectral Function Formalism Omar Benhar, Omar Benhar In the impulse approximation regime, factorization of the nuclear cross section provides a unified and consistent framework for extracting the information on target structure and dynamics from the data, thus allowing to assess the validity of nuclear models. This scheme, whose basic element is the nuclear spectral function, has been remarkably successful in explaining electron-nucleus scattering data at beam energies around and above 1 GeV. Being an intrinsic property of the target ground state, the spectral function determines the cross section in any channels, for both charged lepton and neutrino beams. In addition, being trivially related to the two-point Green's function, it allows to pin down the effects of nucleon-nucleon correlations in a fully model independent fashion. I will briefly discuss the potential and limitations of the spectral function formalism, and its extensions to include effects---such as final state interactions and coupling to meson-exchange currents---not taken into account at the impulse approximation level. |
Saturday, October 27, 2018 10:30AM - 10:45AM |
LK.00006: Removal and Binding Energies in Lepton Nucleus Scattering Arie Bodek We investigate the Fermi momentum and nuclear interaction energy parameters that should be used in modeling quasielastic (QE) electron and neutrino scattering on bound nucleons within the framework of the Relativistic Fermi Gas model (RFG). We discuss the relation between interaction energy, spectral functions and shell model energy levels and extract updated interaction energy parameters from more modern ee'p spectral function data. We address the difference in parameters for scattering from bound protons and neutron, and the difference between the parameters for modeling the PEAK versus the MEAN of distributions. We show that different MC generators use different definitions of what is referred to as nuclear interaction energy parameters. For example, for neutrino scattering on bound neutrons in Oxygen the Smith-Moniz interaction energy (43.0+-3 MeV) should be used in NEUT, the excitation energy ( 10.2+-3 MeV) should be used in GENIE, and the interaction energy ( 27.0 +-3 MeV) should be used to calculate the neutrino energy from muon variables only. |
Saturday, October 27, 2018 10:45AM - 11:00AM |
LK.00007: Latest results from MicroBooNE Andrew Furmanski MicroBooNE is a 85,000 kg active mass liquid argon time projection chamber in the booster neutrino beam at Fermilab. Its primary goals are to investigate the anomalous excess of electromagnetic shower events in MiniBooNE, develop liquid argon detector technology for future multi-kiloton experiments, and to make the first detailed measurements of neutrino interactions on argon. This talk will present the status of MicroBooNE’s data taking, and the latest cross section measurements from the first year of data, along with future prospects. This is some of the first data that can be compared to recent electron-argon scattering data. |
Saturday, October 27, 2018 11:00AM - 11:15AM |
LK.00008: Neutral Current Neutrino Scattering from the Deuteron Sabine Jeschonnek, T. William Donnelly, J. W. Van Orden Exclusive electron scattering from the deuteron at GeV energies has been studied in experiments at Jefferson Lab and treated using relativistic modeling. The theoretical description of initial- and final-state interactions developed for electron scattering can also be used for neutrino scattering. Employing a deuteron target, for instance using heavy water, allows one to reconstruct the kinematics of the neutrino reaction, in particular the incident neutrino energy.
I will describe the formalism adapted for neutrino scattering, and I will discuss the relevant kinematic limits. Neutral current neutrino scattering from the deuteron might prove to be useful for current and future neutrino oscillation experiments, as well as for further exploration of the strangeness content of the nucleon. |
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